A string inverter is a device integral to the operation of solar power systems, converting direct current (DC) generated by solar panels into alternating current (AC) suitable for use in home and business electrical grids. This type of inverter connects a series of solar panels, termed a ‘string’, enabling efficient energy conversion from each panel’s output to collectively form a higher voltage DC input that is then converted to AC. The efficiency of string inverters often ranges around 97% to 98%, making them a popular choice due to their balance of cost and performance.
The design of string inverters allows for simpler installations and maintenance compared to micro inverters, as they manage multiple panels rather than individual ones. They are typically installed in locations with consistent solar irradiation and minimal shading, as the performance of the entire string is limited by the lowest performing panel. Advanced models include features like maximum power point tracking (MPPT), which optimises the voltage to maximise energy harvest from the solar array. The lifespan of a string inverter ranges between 10 to 15 years, necessitating fewer replacements over the operational life of the solar installation. Their application is widespread in residential, commercial, and utility-scale solar projects, underscoring their adaptability across various scales of solar energy generation.
